Advanced Materials Research Vols. 291-294

Abstract: The hierarchical topology of wireless sensor networks can effectively reduce the consumption in communication. Clustering algorithm is the foundation to realize herarchical structure, so it has been extensive researched. On the basis of Leach algorithm, a distance density based clustering algorithm (DDBC) is proposed, considering synthetically the distribution density of around nodes and the remaining energy factors of the node to dynamically banlance energy usage of nodes when selecting cluster heads. We analyzed the performance of DDBC through compared with the existing other clustering algorithms in simulation experiment. Results show that the proposed method can generare stable quantity cluster heads and banlance the energy load effectively.

Abstract: The influence of centerline and the cross-section variation to aerodynamic performance of the inlet was researched in a wider range. A new method of measuring the total pressure recovery coefficient and total pressure distortion coefficient of the inlet was proposed. Based on the loitering aircraft, a s-shaped inlet was designed to meet the needs of stable flight of loitering aircraft, whose total pressure recovery coefficient is 93.2% and total pressure distortion coefficient is 1.2%.

Abstract: The stabilization of slopes by placing passive piles is one of the innovative slope reinforcement techniques in recent years. There are numerous empirical and numerical methods for designing stabilizing piles. They can generally be classified into two different types: (1) pressure/displacement-based methods; (2) finite element/finite difference methods. However, seldom studies have been done on the stratified rock slope reinforced by piles, so in the present paper, the numerical simulation software FLAC3D is adopted to model the stratified rock slope, then the reinforced effect like deformation and stress of slope are studied, showing that if the pile is driven at the mid-bottom place of slope surface, the effect of controlling deformation of rock mass is the best. With increase of the length of pile, the maximum displacement of slope is decreased gradually.

Abstract: Unidirectional solidification technology is a producing process of cast large-sized ingots industry and control the single orientation microstructure of solidification. Combined with the conditions of production, casting the 23t ingot of unidirectional solidification for experiment, we made numerical simulation of the 23t unidirectional solidification ingot with MARC; these are consistent with the result of experiment, and testified the simulation is feasible, offered gist for the design of the mould and casting, and took on reference to the product field.

Abstract: The main drive shaft is one of the key component of the Hydro-Viscous Drive device. The advantage or not of the mechanics performance as the shaft running became the focus of technology design since the complexity of structural design caused by complex function and the strain displacement caused by alternating stress in the condition of low-speed and heavy-duty. The mechanics analysis has been accomplished by the traditional way of mechanics and been proved by the ANSYS , as well as the orderliness of the stress and stain been obtained on the condition of bearing conditions in this paper. The result of the finite element analysis has offered the design reference for the shaft optimizing and pointed out that there was the biggest stress and strain value near the oil hole φ22 in the direction of radical.

Abstract: Based on exist algorithm for STL model slicing. We proposed an algorithm that is based on STL model coordinate layering. When loading STL model, the algorithm layers the model according to the apex coordinate Z of each triangular facets. then calculate intersections according to the topologic relationship among interval edges and apexes of triangular facets in layers. Produce CLI files for rapid prototyping. The method optimized data frame and improved efficiency of slicing.

Abstract: In this paper, analyze the motion rules of multiple-spindle linkage motion in machining complex ruled curved surfaces by WEDM. Sum up the motion parameters and motion types in machining various complex surfaces by WEDM. According to the basic principles of the forming of ruled surface in spatial analytic geometry, establish five-spindle linkage motion cutting system. Prove the correctness of the mathematics models by means of computer simulating. In turn, verify the correctness of the computer simulating by machining simple parts. Therefore, give the theoretical base for the application in production. Solve the problem in cutting parts with complex surfaces and widen the range of processing complex surface by WEDM. This method gets better application in model manufacture.

Abstract: A method for motion control and analysis of five-axis milling machine was proposed by means of simulation. The method started from solid modeling of five-axis milling machine in PRO/E, and then imported the model into ADAMS, generating its own solid model, through seamless interface software Mechanism/Pro 2005. Therefore, co-simulation of PRO/E and ADAMS was realized. On the platform of ADAMS, constraints and drivers necessary for simulation was added to the solid model and the simulation was begun. During the simulation process, motion parameters of each head were produced, and these information directly provided a control basis for NC machining of five-axis milling machine. Thus, the performance study of five-axis milling machine through simulation was realized on the computer and it provided an effective method for the engineering design of the machine.

Abstract: Springback is one of main reason for inaccuracy of sheet metal formed product. Therefore prediction of springback is very important for production of precise products. Springback is an elastic material recovery after unloading of the forming tools, and causes variations and inconsistencies of final part dimensions. This is affected by various parameters involved in the process of sheet metal forming. The main aim of this paper is to investigate the springback of finished part by analysing and controlling the effects of the control parameters on the springback of advanced high strength steels (AHSS). This is done by modelling a deep-drawing process and analysing the results as determined on ANSYS finite element analysis software.

Abstract: A pore network model for drying of grain materials was established on the base of pore network theory and transport process principle, and a corn drying experiment was conducted to verify the validity of this model. The experiment and simulation results indicated that this model could explain the drying process of grain materials well. There is a significant difference between the corn and pore vapor temperature, and it is unreasonable to confuse the two kinds of temperature. The particle size distribution has a great effect on the drying process. The higher the uneven degree of particle size distribution was, the slower the grain materials were dried and the more unbalanced the moisture distribution appeared.